package com.miyu.common.utils.commonUtils;

import java.security.MessageDigest;
import java.util.UUID;

public class CommonUtils {

    /**
     * uuid生成
     * @return
     */
    public static   String getUUID(){
        String uuid = UUID.randomUUID().toString().replaceAll("-","");
        return uuid;
    }

    /**
     * 根据字符转换MD5可校验数据时候重复
     * @param inStr
     * @return
     */
    public static String MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return "";
        }
        char[] charArray = inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];
        for (int i = 0; i < charArray.length; i++) {
            byteArray[i] = (byte) charArray[i];
        }
        byte[] md5Bytes = md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i < md5Bytes.length; i++) {
            int val = ((int) md5Bytes[i]) & 0xff;
            if (val < 16) {
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }

    /**
     * 字符转驼峰
     *
     * @param str str
     * @return {@code String}
     */
    public static String caseHump(String str){
        String upCase="";
        char[] buffer = str.toCharArray();
        char a = '_';
        for(int i=0;i<buffer.length;i++){
            char ch = buffer[i];
            if(ch==a){
                char aa= buffer[i+1];
                buffer[i+1] = Character.toUpperCase(aa);
            }
        }
        upCase = (new String(buffer)).replaceAll("_", "");
        return upCase;

    }
}
